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Acquisitions - Additional Information (details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
Aug. 01, 2012
Jul. 31, 2009
Nov. 25, 2014
Sep. 30, 2010
Business Acquisition [Line Items]                
Revenues $ 1,273,763us-gaap_Revenues $ 1,029,763us-gaap_Revenues $ 894,476us-gaap_Revenues          
Operating expenses 883,262us-gaap_CostsAndExpenses 735,566us-gaap_CostsAndExpenses 716,209us-gaap_CostsAndExpenses          
Delaware Basin Midstream Limited Liability Company [Member]                
Business Acquisition [Line Items]                
Revenues 12,500us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= wgp_DelawareBasinMidstreamLimitedLiabilityCompanyMember		              
Operating expenses $ 10,400us-gaap_CostsAndExpenses
/ us-gaap_BusinessAcquisitionAxis
= wgp_DelawareBasinMidstreamLimitedLiabilityCompanyMember		              
Western Gas Partners [Member]                
Business Acquisition [Line Items]                
Percentage acquired 100.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		              
Western Gas Partners [Member] | Newcastle [Member]                
Business Acquisition [Line Items]                
Percentage acquired 50.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
/ us-gaap_BusinessAcquisitionAxis
= wgp_NewcastleMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		     50.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
/ us-gaap_BusinessAcquisitionAxis
= wgp_NewcastleMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		        
Western Gas Partners [Member] | Fort Union [Member]                
Business Acquisition [Line Items]                
Equity investment ownership       14.81%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= wgp_FortUnionMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		        
Western Gas Partners [Member] | Chipeta Processing Limited Liability Company [Member]                
Business Acquisition [Line Items]                
Percentage acquired 75.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
/ us-gaap_BusinessAcquisitionAxis
= wgp_ChipetaProcessingLimitedLiabilityCompanyMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		       24.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
/ us-gaap_BusinessAcquisitionAxis
= wgp_ChipetaProcessingLimitedLiabilityCompanyMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [1] 51.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
/ us-gaap_BusinessAcquisitionAxis
= wgp_ChipetaProcessingLimitedLiabilityCompanyMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		    
Western Gas Partners [Member] | White Cliffs [Member]                
Business Acquisition [Line Items]                
Equity investment ownership               10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= wgp_WhiteCliffsMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember
Western Gas Partners [Member] | Delaware Basin Midstream Limited Liability Company [Member]                
Business Acquisition [Line Items]                
Percentage acquired             100.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
/ us-gaap_BusinessAcquisitionAxis
= wgp_DelawareBasinMidstreamLimitedLiabilityCompanyMember
/ dei_LegalEntityAxis
= wgp_WesternGasPartnersMember		 [2]  
[1] WES acquired Anadarko’s additional Chipeta interest (as described in Note 1). WES received distributions related to the additional interest beginning July 1, 2012. This transaction brought WES’s total membership interest in Chipeta to 75%. The remaining 25% membership interest in Chipeta held by a third-party member is reflected as noncontrolling interests in the consolidated financial statements for all periods presented.
[2] WES acquired Nuevo Midstream, LLC (“Nuevo”) from a third party. Following the acquisition, WES changed the name of Nuevo to Delaware Basin Midstream, LLC (“DBM”). The assets acquired include cryogenic processing plants, a gas gathering system, and related facilities and equipment, which serve production from Reeves, Loving and Culberson Counties, Texas and Eddy and Lea Counties, New Mexico. These assets are referred to collectively as the “DBM complex.” See Note 4 for a discussion of the WES Class C units.